________ late for yesterday's class meeting,as it was so important.
A.couldn't be
B.shouldn't be
C.mustn't have been
D.oughtn't to have been 解析:oughtn't to have done同于shouldn't have done表示“不该做某事而做了”。由句意知D合题意。 答案:D (3)“could+have+v.ed”意为“本能够,本可以”,表示过去本可以做某事,但却没做。 这样考过 (江苏)He did not regret saying what he did but felt that he ________ it differently. A.could express
B.would express C.could have expressed
D.must have expressed 解析:句意:他不后悔说了他做了什么,而认为他本能够用不同的方式表达。could express 能够表达;would express 要表达;could have expressed 本来能够表达;must have expressed(表推测)肯定已经表达。 答案:C (4)“needn't+have+v.ed”意为“本没有必要”,表示过去本没有必要做某事,但却做了。 注意:“need not+have+v.ed”表示过去本不必做但却做了的事;“did not need to+动词原形”表示过去不必做某事而实际上也没有做。如:
She need not have come yesterday.她昨天本不必要来的。(但却来了)
She didn't need to come yesterday.她昨天不必来。(实际上也没来) 三、固定用法 can't too...无论怎样也不过分,越……越好;can't help doing情不自禁做某事;may/might as well还是做……的好;would rather...than宁愿做……也不愿做……。 这样考过 (龙岩质检)Traffic safety is so important that everyone ________ take safety measures too seriously. A.shouldn't
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